Title:
VARIABLE CAPACITANCE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2007/145259
Kind Code:
A1
Abstract:
It is possible to provide a variable capacitance circuit of a small size capable
of reducing distortion and current consumption and satisfying the power resistance
at a low cost. The variable capacitance circuit includes: a first variable capacitance
element unit formed by connecting n (n is a natural number not smaller than 2) variable
capacitance capacitors including at least one variable capacitance element
having a dielectric layer whose dielectric constant changes in accordance with
an applied DC voltage and a pair of electrodes sandwiching the dielectric layer,
the n first variable capacitance element units being connected in series when
viewed from high frequency and in parallel when viewed from DC current; and a second
variable capacitance element unit to which voltage amplitude smaller than voltage
amplitude of a high-frequency signal applied to the first variable capacitance
element unit is applied and which includes one variable capacitance element
or m (m is a natural number smaller than n) variable capacitance capacitors which
are connected in series.
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Inventors:
KATTA HIROSHI (JP)
Application Number:
PCT/JP2007/061933
Publication Date:
December 21, 2007
Filing Date:
June 13, 2007
Export Citation:
Assignee:
KYOCERA CORP (JP)
KATTA HIROSHI (JP)
KATTA HIROSHI (JP)
International Classes:
H03H7/00; H01G7/06; H03H5/12; H03H7/20; H03H7/38
Foreign References:
| JP2005150466A | 2005-06-09 | |||
| JP2005184270A | 2005-07-07 | |||
| JP2005508096A | 2005-03-24 | |||
| JP2001111387A | 2001-04-20 | |||
| JP2005101773A | 2005-04-14 |
Other References:
See also references of EP 2040376A4
Attorney, Agent or Firm:
SAIKYO, Keiichiro et al. (2-6 Bingomachi 3-chome,Chuo-ku, Osaka-shi, Osaka 51, JP)
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